The Haven for Hope, a homeless shelter in San Antonio, is one of dozens of locations around 20 South Texas counties where people are now being tested for latent tuberculosis infections. Wendy Rigby/Texas Public Radio hide caption
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intravenous drug use
In Philadelphia, some drug users are selling clean needles from needle exchange programs on the street. Researchers say the black market isn't necessarily a bad thing. ImageZoo/Corbis hide caption